Sound syncronisation

[Guest]

Quote[/b] (huckw @ Sep. 17 2004,11:45)]I do NOT have SBE enabled as my PC apparently can't hack it when viewing on the PC.

I did have SBE enabled but now I have it disabled. Doesn't seem to have any/much influence on the sync issue. With LiveTV I clearly notice some desync between the audio and the video. I estimate it's a matter of a few dozens of milliseconds.

I really don't get it... ivtv outputs an MPEG stream containing the video and audio, so if you play that MPEG stream it's nearly impossible to have sync problems.

Is it a pvr350 driver issue or a GB PVR issue?

[sub]

Quote[/b] ]I really don't get it... ivtv outputs an MPEG stream containing the video and audio, so if you play that MPEG stream it's nearly impossible to have sync problems.

Thats exactly what I'm doing. I'm not parsing or altering the MPEG2 stream. I just pass it straight to the PVR350 decoder. It is responsible for using the presentation time stamps from the stream to determine when it should play each piece of data.

[Guest]

Quote[/b] (sub @ Sep. 18 2004,18:15)]

Quote[/b] ]I really don't get it... ivtv outputs an MPEG stream containing the video and audio, so if you play that MPEG stream it's nearly impossible to have sync problems.

Thats exactly what I'm doing. I'm not parsing or altering the MPEG2 stream. I just pass it straight to the PVR350 decoder. It is responsible for using the presentation time stamps from the stream to determine when it should play each piece of data.

So then it must be a driver/firmware issue. Btw, I also noticed that the latency is depending on the bitrate of the content. If you change the audio or video encoding bitrate, the amount of desync changes as well.

I really hope it can be fixed somehow because in Linux I have perfect A/V sync.

Anyway, thanks for your reply

[Splyf]

I am sure this have to do with the skip function. I am using PVR-350 newest Hauppauge software and the newest GB-PVR.

All playback seems fine until I use the skip button. Then syncronisation is lost.

Thanks for a great piece of work anyway !

[stefan]

In another thread somewhere, the solution to defragment the hard drive was presented. It's worth a try; it worked wonders for me. Too bad you have to do it once a week or so, though...

[erikl]

I had a similar problem after upgrading to last release...
So, i thought it had to do with some new code in the app so i  reinstalled v. 22.7, but lo and behold, there was still lagging audio...

Hmm... this was strange, so i decided to see if it perhaps were the drivers to my pvr-350 that behaved bad, and it actually was.

My solution was simple, just turn off Play local in the prefs-menu in WinTV2000, exit the app and then start gb-pvr again.

And it works like a charm again...
The lag was perhaps half a second...

*edit* clenaing up the mess...

[stefan]

Quote[/b] (erikl @ Dec. 07 2004,14:33)]My solution was simple, just turn off Play local in the prefs-menu in Win2000

I assume you mean WinTV2000? Otherwise I'm really curious as to what you mean =)

[erikl]

ah yes, WinTV200 of course

[blader_se]

I also have annoying audio desync, it's so big that I can't really use LiveTV at all. It is not affected by pause/play...
I'm using PVR-250.

[hasso]

Well, I've just started on the PVR road and am finding GBPVR the best of all the products I have tried. I am now on the verge of retiring my mechanical VCR....

Except I also have those audio-sync issues that others have mentioned in this thread. This happens when I use the PVR350's video and sound out with GBPVR. It varies from being barely noticeable to being a bit annoying (from a few milliseconds to maybe half a second). Annoying enough so that my wife says "go back to the old fashioned VCR please".

I really, really want to retire the VCR.

When I play the same clip through PowerDVD or WinDVD using software decoding I do not appear to have this problem. Using different capture rates doesn't seem to do anything to solve this problem. I have not tried erikl's suggestion. I will tonight, but was wondering if any of you have had success in overcoming this weird problem or is it a PVR hardware or driver problem which I have to live with?

PVR350 running on a Epia M10000 with 512 MB memory.

Hasso.